Question

5. You place millions of euglena into a container and place it by the window. The entire container is a bright green color as the euglena swim freely. You cover half the container, block out the sunlight. At the end of the day, you return to the container and find that all the euglena are now on the uncovered side. Explain why this happened. Your answer must include the works: eye spot (stigma), sunlight, and photosynthesis.

Answer 1

Answer:

it receive the stimulus of sunlight in the eye spot that makes them move towards the yncovered site for performing photosynthesis.

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Answer 2

All the euglena are on the uncovered side because of 'photosynthesis'

• Euglena/Euglenoids is a  Unicellular bacteria with a flexible body.
• They may be found in marshes, freshwater, sea, and damp soil.
• They possess the characteristic features of plants and animals.
• The euglena's chloroplasts capture sunlight for photosynthesis.
• Chloroplasts with chlorophyll are found in Euglena. These chloroplasts appear to have been obtained through an endosymbiotic interaction and are of green algal origin.
• They convert sunlight into energy, but they also need other organic elements and vitamins, such as vitamin B12.
• When growing in the dark and obtaining nutrients heterotrophically from organic materials, some of the photosynthetic euglenoids lose their chlorophyll.
• Euglena species can also be heterotrophs.
• The eyespot is situated at the flagellum's base in the gullet and is a whip-like locomotory structure.
• This sensitive region of the flagellar base senses the light coming from the other end of the organism's pigment rods.
• In the experiment, all the euglena moved to the uncovered side because they require sunlight for photosynthesis, and the eyespot helped them to detect sunlight.

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